package com.app.backend.common.utils;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class SM4Utils {
    private String secretKey = "";
    private String iv = "";
    private boolean hexString = false;

    public SM4Utils() {
    }


    public String getSecretKey() {
        return secretKey;
    }

    public void setSecretKey(String secretKey) {
        this.secretKey = secretKey;
    }

    public String getIv() {
        return iv;
    }

    public void setIv(String iv) {
        this.iv = iv;
    }

    public boolean isHexString() {
        return hexString;
    }

    public void setHexString(boolean hexString) {
        this.hexString = hexString;
    }

    public String encryptData_ECB(String plainText) {
        try {
            SM4_Context ctx = new SM4_Context();
            ctx.isPadding = true;
            ctx.mode = SM4.SM4_ENCRYPT;

            byte[] keyBytes;
            keyBytes = secretKey.getBytes();
            SM4 sm4 = new SM4();
            sm4.sm4_setkey_enc(ctx, keyBytes);
            byte[] encrypted = sm4.sm4_crypt_ecb(ctx, plainText.getBytes("UTF-8"));
            String cipherText = new BASE64Encoder().encode(encrypted);
            if (cipherText != null && cipherText.trim().length() > 0) {
                Pattern p = Pattern.compile("\\s*|\t|\r|\n");
                Matcher m = p.matcher(cipherText);
                cipherText = m.replaceAll("");
            }
            return cipherText;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public String decryptData_ECB(String cipherText) {
        try {
            SM4_Context ctx = new SM4_Context();
            ctx.isPadding = true;
            ctx.mode = SM4.SM4_DECRYPT;

            byte[] keyBytes;
            keyBytes = secretKey.getBytes();
            SM4 sm4 = new SM4();
            sm4.sm4_setkey_dec(ctx, keyBytes);
            byte[] decrypted = sm4.sm4_crypt_ecb(ctx, new BASE64Decoder().decodeBuffer(cipherText));
            return new String(decrypted, "UTF-8");
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public String encryptData_CBC(String plainText) {
        try {
            SM4_Context ctx = new SM4_Context();
            ctx.isPadding = true;
            ctx.mode = SM4.SM4_ENCRYPT;

            byte[] keyBytes;
            byte[] ivBytes;

            keyBytes = secretKey.getBytes();
            ivBytes = iv.getBytes();

            SM4 sm4 = new SM4();
            sm4.sm4_setkey_enc(ctx, keyBytes);
            byte[] encrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, plainText.getBytes("UTF-8"));
            String cipherText = new BASE64Encoder().encode(encrypted);
            if (cipherText != null && cipherText.trim().length() > 0) {
                Pattern p = Pattern.compile("\\s*|\t|\r|\n");
                Matcher m = p.matcher(cipherText);
                cipherText = m.replaceAll("");
            }
            return cipherText;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public String decryptData_CBC(String cipherText) {
        try {
            SM4_Context ctx = new SM4_Context();
            ctx.isPadding = true;
            ctx.mode = SM4.SM4_DECRYPT;

            byte[] keyBytes;
            byte[] ivBytes;
            if (hexString) {
                keyBytes = CodeUtil.hexStringToBytes(secretKey);
                ivBytes = CodeUtil.hexStringToBytes(iv);
            } else {
                keyBytes = secretKey.getBytes();
                ivBytes = iv.getBytes();
            }

            SM4 sm4 = new SM4();
            sm4.sm4_setkey_dec(ctx, keyBytes);
            byte[] decrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, new BASE64Decoder().decodeBuffer(cipherText));
            return new String(decrypted, "UTF-8");
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }


//    public static void main(String[] args) throws IOException
//    {
//        String plainText ="ssda撒打飞机了ii&$$^##)*&6223';.,[]";
//        SM4Utils sm4 = new SM4Utils();
//        sm4.secretKey = "11HDESaAhiHHugDz";
//        plainText.getBytes("UTF-8");
//        System.out.println("ECB模式");
//        String cipherText = sm4.encryptData_ECB(plainText);
//        System.out.println("密文: " + cipherText);
//        System.out.println("");
//
//        plainText = sm4.decryptData_ECB(cipherText);
//        System.out.println("明文: " + plainText);
//        System.out.println("");
//
//        System.out.println("CBC模式");
//        sm4.iv = "UISwD9fW6cFh9SNS";
//        cipherText = sm4.encryptData_CBC(plainText);
//        System.out.println("密文: " + cipherText);
//        System.out.println("");
//
//        plainText = sm4.decryptData_CBC(cipherText);
//        System.out.println("明文: " + plainText);
//        //PI4ke7HMoUMD/LOSHWX5/g==
//
//    }
}
